How Much Does Rooftop Solar Really Save in Maharashtra?

Marketing claims of "90% bill reduction" are meaningless without numbers. Here is the actual arithmetic for a Maharashtra household, using conservative generation and realistic tariff slabs.

The generation side

A well-designed 1 kW rooftop system in Maharashtra generates roughly 120 units (kWh) per month across the year — higher in March and April, lower in July and December. So a 3 kW system yields about 360 units monthly, or 4,320 units a year.

The consumption side

MSEDCL residential tariffs are slab-based. The last units you consume are the most expensive, and solar offsets those first. A household consuming 400 units pays for its final 100 units at the highest slab rate.

A worked example: 3 kW system

After payback, the same system keeps producing for another 20 years with only cleaning and an occasional inverter replacement. Over 25 years, most 3 kW owners see cumulative savings in the range of ₹9–₹12 lakh depending on tariff escalation.

What changes the answer

• Tariff slab: the higher your consumption, the faster the payback.
• Self-consumption ratio: using solar during the day beats exporting it, unless your state allows full net-metering credits.
• Dust and cleaning: uncleaned modules lose 8–15% of generation — a genuine ₹8,000–₹14,000 a year on a 5 kW system.
• Design quality: undersized cables, poor earthing and shading cut output silently for years.

Should you take a loan?

At 9.5% over 60 months, the EMI on a 3 kW net cost of ₹1,17,000 works out to roughly ₹2,450 a month — less than the bill saving. In effect the system pays its own EMI from month two, which is why solar loans have become popular among salaried homeowners.

Use our solar savings calculator for your own numbers, or ask us for a written generation and savings estimate based on your actual bill.